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Cryogenic magnetic field sensor based on the magnetoresistive effect in bulk Bi2212+USr2CaO6

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5 Author(s)
Ionescu, M. ; Institute for Superconducting and Electronic Materials, University of Wollongong, Australia ; Winton, B. ; Silver, T. ; Dou, S.X.
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A large magnetoresistive (MR) effect was observed in melt-textured (MT) Bi2212 in which USr2CaO6 was added in a proportion of 6 wt %. The resistivity measurements of MT Bi2212+6 wt % USr2CaO6 show high sensitivity to applied dc fields, as compared to pure Bi2212, in particular at low fields, below 3 T, and in a temperature range between 45 K and 85 K. In this temperature range, the MR effect of MT Bi2212+6 wt % USr2CaO6 is two orders of magnitude larger than the MR effect in pure Bi2212, and display a maximum that may be tuned to a particular temperature within the above range, by changing the amount of added nonsuperconducting compound. A cryogenic sensor was built and tested at 77 K in low fields. It shows a good sensitivity and small (∼1%) hysteresis of resistivity when the applied field was cycled between 0 T and 1 T.

Published in:

Applied Physics Letters  (Volume:84 ,  Issue: 26 )